Overview
- The Servicio Sismológico Nacional recorded a sequence of small, shallow earthquakes off Chiapas between Sept. 2 and Sept. 4, with most events near magnitude 3.7–3.9 and focal depths typically between about 7 and 15 kilometers.
- Mexico's national alert operator SASMEX registered seismic signals for the early Sept. 2 activity but did not activate the public Alerta Sísmica because initial energy estimates did not exceed the system's site thresholds.
- Chiapas Protección Civil and federal authorities reported no perception of damage, no service interruptions, and maintained preventive monitoring of affected coastal areas.
- One outlet published a magnitude‑5.5 reading for a Sept. 2 event near Huixtla but that larger value is not corroborated by other SSN reports and remains disputed.
- The region's frequent small quakes reflect ongoing subduction of the Cocos plate under Mexico and officials are urging residents to review preparedness plans ahead of the national drill scheduled for Sept. 19, 2026.